Port Network

What is a good tool for reporting when someone is port scanning the network?
I want to be alerted when someone is pinging my server. Is there a way to stay informed?
, As a network administrator, using ISA Server 2004, has an option to set up alerts. If the server Attack with "all port scan" I got an alert from ISA Sever. configuration warning microsoft.com see Using
Demonstrating using RS485 port to network NXT
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